<template>

  <el-container class="home-container">
    <!-- 头部区域 -->
  <el-header>
    <div>
      <img src="../assets/heima.png" alt="">
      <span>电商后台管理系统</span>
    </div>
    <el-button type="info" @click="logout">退出</el-button>
  </el-header>
  <!-- 页面主题区域 -->
  <el-container>
    <!-- 侧边栏 -->
    <!-- 根据菜单的折叠与展开分析相应宽度 -->
    <el-aside :width="isCollapse ? '64px' : '200px'">
                                      <!-- 绑定菜单折叠展开 -->
      <div class="toggle-button" @click="toggleCollapse">|||</div>

      <!-- 侧边栏菜单区域 -->
      <el-menu
      background-color="#333744"
      text-color="#fff" active-text-color="#409EFF" unique-opened :collapse="isCollapse"
      :collapse-transition="false" :router="true" :default-active="activePath"><!-- 启用了路由模式 4.default-active高亮模式 -->
      <!-- 一级菜单 -->
                             <!-- index只接收字符串所以加 '' -->
      <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
        <!-- 一级菜单的模板区域 -->
        <template slot="title">
          <!-- 图标 -->
          <!-- 图标根据一级菜单的key.id值循环 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>

        <!-- 二级菜单 -->
        <el-menu-item :index="'/' + sudItem.path" v-for="sudItem in item.children"
        :key="sudItem.id" @click="saveNavState('/' + sudItem.path)"><!-- 1.添加函数,传入值是二级菜单的path地址 -->

          <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{sudItem.authName}}</span>
        </template>
        </el-menu-item>
      </el-submenu>
    </el-menu>
    </el-aside>
    <!-- 右侧内容主体 -->
    <el-main>
      <!-- 路由占位符 -->
      <!-- Welcome子组件定位符 -->
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>

</template>

<script>

export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      // 图标循环
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 菜单折叠还是不折叠
      isCollapse: false,
      // 3. 高亮被激活的连接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    // 5.从本地存储取出来
    this.activePath = window.sessionStorage.getItem('avtivePath')
  },
  methods: {
    logout() {
      // 清除暂时缓存token钥匙
      window.sessionStorage.clear()
      // 跳转到登录一面面
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() { // 菜单
      const { data: res } = await this.$http.get('menus')
      // 如果不等于两百获取数据失败 。 把错误消息打印出来
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    // 点击按钮实现菜单折叠展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 2.保存连接的激活状态
    saveNavState(activePath) {
      // 先把它存入本地存储中
      window.sessionStorage.setItem('avtivePath', activePath)
      // 6.点击的时候赋值
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>

.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    // 左侧边框线对齐
    border-right: none;
  }
}
.el-main {
  background-color: #EAEDF1;
}
.toggle-button {
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
